Ok, so I'll be totally open about the njoy (copy) and how it was so effective for me. If you struggle with the idea of BDSM then don't read any further.
I'm into BDSM and I'm sub, my partner bought the toy. He can bring me to a gspot gush with his fingers but no toy has ever done this before.
A spreader bar held my legs apart and my legs were also further held apart with shibari rope ties as garters on my thighs. He built a rope bar between the garters and inserted the large end of the njoy into my vagina and slipped the other end into the rope bar between the ropes, my legs were raised and I used the crooks of my elbows to hold my legs up. I then just gently moved my bound legs up and down, the effect on the toy was magnified by the distance and the simple movement. My partner encouraged me to move my legs and it was only shallow inside me, the movement caused me to come and gush, it just kept happening again and again.
When (since) I've tried it alone, holding the toy with my hand, I cannot replicate the movement or the intensity, I can almost get it it, but not quite.
I've told this story simply because I think there are elements of situation, of intimacy and (and I think this is most important) not using my hands to move it- the feeling of it being in my control but in a restrained and vulnerable (and safe) situation all added to the pleasure, along with the angle of insertion. I'd suggest anyone who has bought one because of my recommendation, to find a way of moving it with your feet, or in your knickers or any way where there is an element of it being somehow, less thrusty than you might do if you hold it with your hand.
The nearest Ive got to replicating the first use was to rest the small end over a finger like a lever and then use very small movements with shallow insertion rather than hold it like you might hold a dildo or similar. I'm thinking that tying my ankles and slipping it between the tie then moving my legs could replicate and I will try it (but he has the toy ATM and he isn't here, so it will have to wait).
Sorry if this is TMI, but I figured if you have one and you're feeling disappointed, perhaps using it in a different way might help.